Hydraulic installation



Dec. 6, 1924. l ,5 I 9,570

- J. G. WEIR HYDRAULI C INSTALLATION Filed Feb. 2, 1924 Patented Dec. 16, 1924.

ouireo sra'rss PATENT GPF-ICEE...

JAMES GEORGE WEIR, 0,15 CA'IHCART, iGLASGQW, SCOTLAND, ASSIQNOR IO & IT.

LIMITED, 0-]? GLASGOW, SCOTLAND.

IIYQIRAULI C INSTALZLAKEION.

Application fi e Feb ry 2,, 1 i.- Se i l No- 6 ,238-

To cwlgZ whom it may concern:

it t at TL Gannon Wrla, a subject of the King of Great Brita n, and residing at 'Gathoaiit, Glasgow, Scotland, have invented certain new and useful Inlproue nents in Hydraulic Installations; and I .do hereby declare the following to ,be a full, =C- lQ21.1f, ,-2L11Cl exact description lot the invention, such as will-enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to letters or figures of reference marked thereon, which tor n (a part or this specification.

This invention relates to hydraulic installations and comprises improved means for supplying and iniaintaining fluid at a. desired pressure in a main service pipe and the like where the use of an accumulator is inadmissible. In such cases; the use of centni-iugal pumps also has heretofore been inachni'ssible or very objecti nable owing to the very high expenditure ofenergy involve d in continuously running the centrifugal pump at the speed necessary to generate the required pressure. Displacement piunps are therefore commonly ,e-inploy edz such pumps a1:e .especial;ly in the caselo f large installa tions objectionabl y heavy, costly, and ere pensive in upkeep.

d splacement pumps are meant pumps in which the fluid i pumped y b ing or ssecl out-0 a spa-0e (tor example a cylindei) pis on or its equi a ent, asdi ti o from pumps o h el t if-ugal and turb n t re The object of the present invention is to pernglit of the employment tor this service of a centrifugal pump or a. light and compact construction so that the advantages of this type of pump may be obtained without the disad vai ages of high power oonsrunption at low lo .ds. This object is attained by the provision on": a small auxiliary or secondary pump, pre fienably of the displacement type, capable of supplying the amount of pressure fluid required to make up leakages and small demands upon the main service pipe or the like and operating in conjunction or fi-lomhination with ,a. relatively large main pump of the centrifugal type capable of perforlning the run duty or meeting the maxi-11min demands upon the main service pipe. The main pump is connected to the warn as service pipe or the like so that it supp-lies pressure fluid thereto through a non-return valve.

The auxiliary or secondary pump is also onnected up to supply pressure fluid to the 0 main service pipe or the like. This pump 18 of sin-all capacity, but it is capable of supplying the amount of fluid required to make up leakages and for small demands upon the main service pipe.

A governor is provided which controls the supply of actuating fluid to the motor which .drivesthe main pump, the arrangement being such that, as long as the pressure in the main service pipe exceeds a certain minilmun pressure, actuating fluid is supplied to the said motor in ainoaurt only suffic-ient .to maintain. :the pinup continuously running at a re latively lovv speec'l.suc h a speed that the delivery pressure cit the puinp is substantially lower than the Working-pres sur in the main service pipe- Under such conditionswh-ich exist at standby or at low 1o-ad.thoauxiliary pump acts to maintain the working pressune ill the main servnce pipe while the main pu up running at a low speed-=consiunes an amount ofpoxver sina'll'lcompaa ed with What it would absorb were it he tuned to de ver at the service p pe pr ssure.

lvVhen, however, a demand is made on the main service pipe for more fluid than the auxiliary ,puanp .can supply, and vvhen eonsequently the pressure in the main service pipe falls below a certain predetermined value, the governor permits the main pump to receive sufiicient actuating fluid to enable it to home into useful operation and deliver at the requisite pressure to maintain the required working pressure the main service pipe.

llhe present invcntion-evhich will be defined in the annexed c-lainiswi-ll now be more particularly described with reference to the accompanying drawing which illus- 1.00

trates the carrying of the invention into effect in one convenient manner as applied to gun-moving gear for warships.

h is the main service pipe. at is the main pumpof the centrifugal type: it is driven by the steam turbine b: it delivers into the main service pipe through the non-return valve 0) and the pipe 0. a is the auxiliary pump: it is a small displacement pump steam-driven: it discharges into the main service pipe by way of the pipe 71. e is the pipe which supplies steam to the two pumps. 2, is a tank from which the two pumps-by the pipes s and r respectively draw their fluid (for pressure supply).

A governor m is arranged on the steamsupply pipe 6. It is controlled by the pressure in the main service pipe h in such a manner that steam is shut off from the turbine Z) as long as the pressure in the main service pipe exceeds a. certain minimum pressure.

A certain amount of steam is howeverby the pipe 7:allowed to bypass the governor-operated steam valve of the turbine 7), and the governor is so adjusted that this by-pass steam is sufficient in quantity to maintain the pump continuously running at a low speed: at this speed the delivery pressure of the pump is substantially lower than the working pressure in the main service pipe. i

in working at standby or at low load conditions, the small displacement pump 0 is able to maintain the working pressure in the main service pipe; and the steam valve on thesteam pipe to the turbine Z) is shut by the action of the governor. The main pump is rotating at a low speed by means of the by-pass steam, and is accord.- ingly not consuming the large amount or power which it would require were it run nine to maintain the full pressure. Immediately a demand is made on the main service pipe for more fluid than the displacement pump can supply, the pressure falls in the pipe, and the main pump is given full steam'by the governor and comes into useful operation.

The arrangement just. described is for steam-driven pumps; but electrically driven pumps'b0th main and auXiliary1nay be used, if desired, and controlled by suitable devices to operate in a similar manner.

" Having thus described my invention, what I claim as new and desire to. secure by Letters Patent is Q 1. The combination with a main hydrau- 110 service pipe of a main pump of the centrifugal type capable of maintaining the required working pressure in the said pipe under full demands for fluid, an auxiliary pump which is relatively small compared with the said main pump and which is capable of maintaining the required workcentrifugal type capable of maintaining the required working pressure in the said pipe under full demands for fluid, a steam motor driving the said pump,an auxiliary pump which is relatively small compared with the said main pump and which is capable or maintaining the re uired working pressure in the said pipe against small leakages and small demands for fluid, aste'am motor driving the said auxiliary pump, means for supplying steam to thesaid motors, a governor controlled by the pressure inthe said pipe, means whereby the said governor controls the supply of steam tov the said main pump according to the pressure in the said pipe, and a bypass, out of the control, of said governor, whereby steam is passed to said motor in suflicient amount to keep said main pump running at a low speed when only small demands are being made on said pipe.

3. The combination with a main hydrau? lic service pipe of a. main pump of the centrifugal type capable of maintaining the required working pressure in the said pipe under full demands for fluid, an auxiliary pump of the displacement type which is relatively small compared with. the said main pump and which is capable of maintaining the required working pressure in the said pipe against small leakages and small demands for fluid, a governor controlled by the pressure in the said pipe, means whereby the said governor controls the saidmain pump according to the pressure in the said pipe, together with means, out of the control of said governor, whereby the main pump is run at a low speed when only small demands are being made on the said pipe.

4. The combination with a main hydraulic service pipe of a main pump of the centrifugal type capable of maintaining the re quired working pressure in the said pipe under full demands for fluid, a steam motor driving the said pump, an auxiliary pump of the displacement type which is relatively small compared with the said mainpump and which is capable ofv maintaining the required working pressure in the said pipe against small leakages and small demands for fluid, a steam motor driving the said auxiliary pump, means for supplying steam to the said motors, a governor controlled by the pressure in the said pipe, means Whereby the said governor controls the supply of steam to the said main pump according 5 to the pressure in the said pipe, and a bypass, out of the control of said governor, whereby steam is passed to said motor in suflicient amount to keep said main pump running at a 10W speed When only small demands are being made on said pipe.

I hereby sign my name to this specification.

JAMES GEORGE WEIR. 

